Ductor roll timer



l1g- 23, 1932- w. G. HUMPHREY 1,872,739l

DUCTOR ROLL TIMER Filed March 3l, 1930 25 bers. Furthermore, when thePatented Aug. 23, 1932 UNITED SfrATEsA WILLIAM G. HUIVIPHREY, OFTORONTO, ONTARIO, CANADA DUCTOR ROLL TIMER Application mea March 31,

`This invention relates to brake devices for rotating shafts or aXles,and has reference more particularly to such devices as employed inconnection with inking mechanisms of 5 printing presses or-the like to'control the rotation of the ductor roll. i

The ductor roll of an inking mechanism of this type is 'generallymounted in brackets which are pivoted to the frame of the press, and isgiven an oscillatory vmovement in an arcuate path between the fountainroller from which it receives a film of ink and the distributing rolleror plate to which the ink is transferred. Both the fountain roller andthe member to be inked are preferably power driven, and the ductor rollis rotated by rolling contact therewith. In the absence of some meansfor controlling the free rotation of the ductor roll during itsoscillatory movement from one of these members to the other,considerable wear and abrasion of the composition of which the rolls areformed would result from the rather violent conta-ct of the spinning`ductor roll with vthese memductor roll is permitted to resume Contactwith the fountain roller and ink distributing plate or rolle-r atrandom, there usually4 results an uneven distribution of the ink,resulting` in impression area-s of different intensities. This defect isparticularly noticeable and objectionable in color work. y

It is an object of the present inventionto provide a novel brake deviceof the type described which is adapted to prevent the spinning or racingof the'ductor roll. i

Another object is to provide such a device which may be actuated'duringthe oscillatory movement of the ductor roll from the fountain roller tothe ink receiving surface to frictionally engage the ductor roll shaft,so that the ductor roll will be so ytimed as to present a new portion ofits surface to a freshly inked surface of the fountain roller upon eachoscillation, thus insuring an even or uniform distribution of ink to thedistributing members.

Other objects and features of novelty will be apparent from thefollowing description 50 when read in connection with the accompany- Y1930. serial No. 440,573.

ing drawing in which one embodiment of my invention is illustrated byway of example.

In the drawing: Figure 1 is a view in elevation of a portion of a flatbed printing press, showing the relation of the ductor roll timer to theinking mechanism thereof;

vFigure 2 is a vertical central cross-sectional view ofthe timer appliedto the ductor roll shaft; Figure 3 is a transverse cross-sectional viewtaken on line 8-3 of Fig. 2; and y Figure 4'is a fragmentarycross-sectional view taken on line 4-4 of Fig. 2. In Fig. 1 of thedrawing, the numeral 10 65 designates generally a printing press of thefiat bed type provided with the frame 11, supporting members 12 and thehorizontally reciprocating bed 13. At the end of the bed 13 there isprovided an ink plate 14 which is 70 adapted to oscillate beneath theform rollers 15 in the conventional manner. The press is provided withthe usual ink fountain 16 and fountain roller 17, both carried by thebracket 18.V Journalled in the frame 11 of the press is the transverseshaft 20 upon each end of which is mounted one end of a bracket 21.Bearings 22 are formed on the free ends of the brackets 21 for thereception of the ends of the ductor roll shaft or axle 23. The usual Yductor roll 25 is mounted upon the shaft 23 and, upon pivotaloscillation of the brackets 21, it is moved between the full lineposition shown in Fig. 1, where it is in contact with the ink plate 14,and the dotted line position :26, in which it is in rolling contact withthe fountain roller 17.

The fountain roller 17 is driven in the usual manner by means not shown,and the ink plate 14 is oscillated by the conventional and well-knownmechanism.

Although the ductor roll 25, as illustrated and described herein, isdesigned to transfer the ink from the fountain roller 17 to the inkplate 14, it will be understood that my invention is applicable to aninking mechanism wherein the ductor roll is adapted to transfer the inkfrom a fountain roller to one of the distributing rollers of the press.

The ductor roll 25 is adapted to rotate in um would be halted abruptlyand damage tothecomposition of the ductor roll 25 or the fountain roller17 wouldien'sue; Furthermore; ifr

this free rotation of the ductor rolliwereperniitted, the ductor rollwould Contact with the fountain roller 17 andrtheinkplatey 14eat randompoints having no relation to the areas of i previous: contact fbyj thevductenT roll. This wouldv 'obviously cau'sefan' uneven distribution ofink on the ink plate or distributing roller and' would'iresult-instreaking' or va-riationsin intensity of th'efimpression-l I Thus;inf order' to prevent 2tlre:-'-f1eefrotatio.1r of the duct-or rollduring itsfoscillatory.move# ment and toso time :the rotation ofthedfuctor roll that i it Will gpresent i' aanew` portionl 'offitssurface to the fountain roller upon eachtoss cililation,there-isprovidedthe brake or :timing device designated :generally by 'the numeral 30;?kThfisltinier'j30lis provided with alsl'eevelike body member 31 Wh-ichisadaptfedto"surs rou-dfthe 4'duetorrroll sliaftf2'3`and te. bei carriedthereby This ybody member 31 is,V pro vidediwith `:an extensie-11132andfhas anel-oni gated slightlyV curved surface 33T the; function ofiwhlichfwill later described- The in; ternal diameter of f thesleeve-"like rbodfyi por'- tion 31 is largerthanrtheldiafmeteroftheshaft 23-,i .and the interiorrsurface offf'f 'this' niemlber isgenerally cylindrical fbutfis pro-vided YW-ith the`4 fiattenedl area' 34upon one: sid'ef thereof.

Aiiexiblebrake band: 35, preferab-lfyl formed of sheet metal andprovid'ed'-witlrla-:lining 36 frmedof a suitable `frictional mat-'erial,is disposedffwithin the borefof f the l`memberf31, so'asfrto partially-Isu'rroundfthei periphery'l of the shaft 23.`. One endof I'tire' brakeband 35 issecuredito the body .meinber- 31 bymean'sof thleirivets`V or.yother! securing nreansf yr37i The otherzend'ioff the ibrakeffband35"'is-provided with thserod 38 wh''iclrpasses lateralfly-th'ereithrough Hand Ittre endsi of whifchare Adisposed iniYtheisocketsf=391fofiftlrei ringsf 40.1 Each o-f these rings 40 arerotatablyv seated imam-1an:- nulfarifdepression' 41 frmed'inei'tlierrside of the sleeve-'like'portion 131 andfareadaptedto clos ely v'surround: the shaft T232.`

A yoke member 42de:prowidedwith. arms 432 which are. adapted to receivebetween-them the j bodyfmemberi '31.Y The arms 243 are ree cessed toreceive the shaft 23'and are adaptedtov b'e'ari'gid'ly'.secu-red .tothefringsl40 byameasns ofthe screws 44; Itwi'll thus be'seenzftlratrotation! of? thier' yoke'l member '42 'about the shaft 23`relatively1to the bodyfm'emberS-l in a clockwise direction, as seen infFig. 2,-will v cause thebrake bland i35'to: tighten' upon-the shaft 23, thusincreasing the friction between the brake device and the shaft.

The body portion of the yoke member 42 is designed to carry anadjustable contact arm 45 which is provided with a roller 46 journalledin its outer end, and is secured to the -yok=ec42bymeans .ofthe-screwi47 which israd-pted'te passfthrougliithe slo'tai48in the arm45 and is selectively threaded in any one of a plurality of openings 49in the yoke. The body' portionl Aof 4the-yoke 42 is cut away atitsforrvard edge as at 50 to provide clearance for the roller 46 in theretracted position of thearm45. Inorder to rigidly retain the arm 45 inits adjusted position, there is provided uiear `.the f-rear ed ge;v ofthef bodyi portion o\f the ;yoke:-42 the blookl, through whfichis:

threaded :thiewset: serew- 52 :which is-4 adapted to:engage-:thef'rea-rend lof therarm- 45-as 11h53.? Tshe seti'serew 52iisfadapted tobei-'locked A:in-toV position by means offth'efn'ut54;

Referringsto Fig'. 1 of :the dra-wing, there'is provided a'bra-cketwhich ismounted upon therframe 11 asat--and isi-formed'upon` itsouter`endfwitlrvtherarcuate camrsurface l56.A Tlie':4 cam surface(A 56isconcentricfwith*` thebearing; surface l^33-`of the l'brake lmemberrand formsfa cooperatingnguide surfacetherewithtoI` prevent rotation.ofith'e brake" member about etheshfaft 23 of the ductorro'llf:

The-:cams :surface 56 isro-ffr 'suclr length :that in theifuppernrost.positi on" .of f thexductor roll? wireirit ise'in :Contact .fwithftthe:ink-'receiving surface :of the 'distributor 'plate oriroller; the

roller 46f2ofzthe contact-lor:actuatingzagrnrzt isnotiirrrcontaetwithctheacanr surface; VVihen theuductomrorlil 126 isin itslowermost'rposition inf: Contact:` with the? fountain roller 17,'T theguiele .sufrface=r33 oef-thevbodymember A31v of thebrakehascleared 'thelower'en'd of the cam surface suiicientlyto permit ali-slight rot-a-vtien: thereof i to lfreleasefthe l pressure of i the brakeeupon:thefductor'froll shaft; Assoon as the rink plate-14ffhas beenzretractedrand' the ducten' 'rollf 23?: starts its movement toward therfountainr`'roller-17; thef'roller 46 `com-es in contact with the cam surfaeef',:theyo'ke members-'42:isfrotated Arelativelyvto `the body member 31;thus tightening the-:brake band 35vupontlre-shaft 23-and effectivelyprever-it; ing or diminishiirgi-he*rotation ithereof. Iii-A stead :ofthaefattaching nieans1-57 any' suitable means maya-be provided .tofadjust theccami about the l'shaft' 20 as* af centergztoffp'roperlyposition .tliefcamr: with fresp'ect '.to the movements of 'the ductorrolt.

B y thefproper'adjustment 'of Vthe'arm i455, relativelytoi the yokememberf42, the tension of thel brake f member 'maybe-'regulated withgreat accuracy so that 1 just enough rotation of i'tl'i'eeductor'rollisfpermitted inl'order to time the contact thereof-witlrthefountainroller and"distributorfm'ember to insure* an equalTandlunifrmdistribution of the ink to the various rollers: Contactofth'e ductor roll with the fountain roller may be attained the properinstant by starting the press, noting the areas of contact of the ductorroll and the fountain rol-ler and adjusting the effective length of thearm 45 by means of the set screw 52 until the ductor roll is timed tomake contactl at the proper instant.

It will thus be seen that there is provided by means of my invention adevice which will permit the free rolling contact of the ductor rollwith the fountain roller and ink distributor members, but which willcontrol the rotation of the ductor roll during its oscillatory movementfrom one of these members to the other, so as to time its rotation withrespect to the movements of these members in order to insure smoothoperation and uniform distribution of ink. y

Various changes and modifications may be made in the embodiment shownand described herein, without departing from the scope of my inventionas defined by the following claims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. In an inking mechanism for printing presses or the like, including afountain roller, a member to be inked, and a ductor roll mounted on anaxle so as to oscillate bodily between said fountain roller and saidmember and to rotate in rolling contact therewith; in combination, abrake member carried by said axle and comprising a body portion, a yokeportion movable relatively to said body portion, a flexible bandconnected at its ends with said body portion and said yoke portionrespectively, means carried by the frame of the press for moving saidyoke portion relal. tively to said body portion to cause said band togrip said axle to control the rotation thereof.

2. In an inking mechanism for printing presses or the like, including afountain roll,-

1., er, a member to be inked, and a ductor roll mounted on an axle so asto oscillate bodily between said fountain roller and said member and torotate in rolling contact therewith; in combination, a brake devicecarried by said axle and comprising a sleeve-like member having a guidesurface adapted to surround said axle, a iexible brake band disposedbetween said member and said axle and secured at one end to said member,a pair of rings rotatably disposed at each side of said member, theopposite end of said band being pivotally secured at each side thereofto one of said rings, a brake actuating yoke rmember having a bodyportion and a pair of arms adapted to receive said sleeve-like memberbetween them and perforated for the reception of said axle, said ringsbeing rigidly secured to said arms, an extensible arm projecting fromthe body portion of said yoke and provided with anti-fric-tion means atthe end thereof, and a cam adjustably mounted upon the frame of thepress and adapted to cooperate with said guide surface of saidsleeve-like member to prevent rotation thereof and to contact with saidanti-friction means to actuate said brake applying yoke.

3. A device as set forth in claim 2 in which said extensible arm isprovided with a slot, attaching means is passed through said slot andselectively secured at one of a plu-v rality of points in said yokemember, and abutment means are provided for said arm comprising a setscrew and locking means therefor.

In testimony whereof I hereunto affix my signature.

` WILLIAM G. I-IUMPHRE Y.

